Here are some synonyms and alternatives for "I hope you are doing well":

• I hope all is well with you.
• I hope you're having a good week.
• I trust you’re doing well.
• I hope this message finds you well.
• I hope you’re having a productive day/week.
• I hope you’re in good health.
• I hope things are going well on your end.
• I trust this message finds you well.
• I hope you’re doing great.
• Sending you warm wishes.

These phrases can be used to express well-wishes in both formal and informal contexts, especially in emails or letters, and help vary the tone to keep it fresh and engaging.